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Description

The 'clientId' parameter from incoming HTTP requests is directly concatenated into OAuth2 server log warning messages without sanitizing control characters. This allows an attacker to inject arbitrary content, including fake log entries, into the server's log files. Users are recommended to upgrade to versions 4.2.2 or 4.1.7, which fixes this issue.

PUBLISHED Reserved 2026-06-05 | Published 2026-06-12 | Updated 2026-06-12 | Assigner apache

Problem types

CWE-93 Improper Neutralization of CRLF Sequences ('CRLF Injection')

Product status

Default status
unaffected

4.2.0 (semver) before 4.2.2
affected

Any version before 4.1.7
affected

Credits

Guanping Zhang reported this vulnerability. finder

References

www.openwall.com/lists/oss-security/2026/06/11/6

lists.apache.org/thread/xw95po30p8th58ms1no6b0f2375cql00 vendor-advisory

cve.org (CVE-2026-50629)

nvd.nist.gov (CVE-2026-50629)

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